Hydrocarbons Test

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Hydrocarbons Test - 57

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Weekly Quiz Competition

Question 1
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The energy required to vapourise one mole of benzene at it's boiling point is $$31.2\ kJ$$. For how long a $$100\ w$$ electric heater has to be operated in order to vaporize a $$100\ g$$ sample of benzene at it's boiling temperature?

A
$$\approx 743\ sec$$

B
$$400\ sec$$

C
$$3.12\times 10^{4} sec$$

D
$$\approx 371\ sec$$

Solution

Power =100 $$ \cfrac { joule }{ sec } $$
For one mole = (31.2X1000) $$ \cfrac { joule }{ sec } $$
for 100gm $$\rightarrow$$ = (31.2X1000) X $$ \cfrac { 100 }{ 78.11 } $$ joule

Equal to 399.4 seconds.
Question 2
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The reaction of one molecule of $$HBr$$ with one molecule of $$1,3-$$butadiene at $$40^{\circ}C$$ gives predominantly:

A
$$3-$$bromobutene under kinetically controlled conditions

B
$$1-$$bromo-$$2$$-butene under thermodynamically controlled conditions

C
$$3-$$bromobutene under thermodynamically controlled conditions

D
$$1-$$bromo$$-2-$$butene under kinetically controlled conditions

Solution

Solution:- (B) $$1$$-bromo -$$2$$-butene under thermodynamically controlled conditions

$$C{H}_{2}=CH-CH=C{H}_{2} + HBr \longrightarrow \underset{1,2-\text{addition product}}{C{H}_{3}-\underset{\overset{|}{Br}}{CH}-CH=C{H}_{2}} + \underset{1,4-\text{addition product}}{C{H}_{3}-CH=CH-\underset{\overset{|}{Br}}{C{H}_{2}}}$$

Under mild conditions (temprature $$= 80 ℃$$), kinetic product is the $$1, 2$$-addition product and under vigorous conditions, (temp. $$= 40 ℃$$) thermodynamic product is the $$1, 4$$-addition product.

Hence, $$1$$-bromo -$$2$$-butene is the major product under a given condition.
Question 3
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Towards catalytic hydrogenation, the least reactive compound is:

A
$${ CH }_{ 2 }{ \ =\ CH }_{ 2 }$$

B
$${ CH }_{ 3 }\ -\ { CH }{ \ =\ CH }_{ 2 }$$

C
$${ H }_{ 3 }C\ -\ { CH }{ \ =\ CH\ -\ CH }_{ 3 }$$

D
$$({ CH }_{ 3 }{ ) }_{ 2 }C\ =\ C({ CH }_{ 3 }{ ) }_{ 2 }$$

Solution

As a number of $$\alpha$$-Hydrogen increases reactivity towards catalytic hydrogenation increases.
$$CH_{2}$$=$$CH_{2}$$ have zero $$\alpha$$-Hydrogen. So, it is least reactive towards catalytic hydrogenation.
Question 4
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Which of the following reactions does not occur in practice?

A
$$Ph_{3}CH + CH_{3}(CH_{2})_{3}Na\rightarrow Ph_{3}CNa + CH_{3} (CH_{2})_{2} CH_{3}$$

B

C
$$CH_3\overset{O}{\overset{||}{C}}CH_2\overset{O}{\overset{||}{C}}CH_3+EtONa \longrightarrow CH_3\overset{O}{\overset{||}{C}}CH =\overset{ONa}{\overset{|}{C}C}H_3+EtOH$$

D

Solution

Option a does not occur in practice. Since the hydrogen attached to Carbon in triphenyl methane is not feasible, the reaction does not occur in practice.
Question 5
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Major product is:

A

B

C

D

Solution
Question 6
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Which of the following compounds can be best prepared by Wurtz-reaction?

A
Iso-butane

B
n-butane

C
n-pentane

D
Iso-pentane

Solution
Question 7
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The number of alkene(s) which can produce-$$2$$-butanol by the successive treatment of (I) $$B_2H_6$$ in tetrahydrofuran solvent and (II) Alkaline $$H_2O_2$$ solution is _________.

A
$$1$$

B
$$2$$

C
$$3$$

D
$$4$$

Solution

$$CH_3-CH=CH-CH_3\overset{(1)B_2H_6}{\underset{(2)H_2O_2/OH^-}{\rightarrow}}\underset{Butan-2-ol}{CH_3-\underset{OH}{\underset{|}{C}}H-CH_2-CH_3}$$.

Option A is correct.
Question 8
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Product (A) is.

A

B

C

D

Solution
Question 9
1 / -0

.

A

B

C

D

Solution
Question 10
1 / -0

Find the product.

A

B

C

D